Phase equilibria in the GaAs and the GaP systems

Controlling the formation of quantum dot pairs using nanohole templates

“…This can be explained both by the greater reactivity of arsenic atoms in the presence of an oxidising agent [28], and also by the fact that loss of arsenic from A-type facets is much faster than from B-type facets at these temperatures due to the different arsenic bonding configuration on these two facets [29]. As the arsenic content of the gallium droplet increases towards its saturated value of $ 0:2% [30] it spreads out due to a reduction in surface tension [31]. Since gallium diffusion is faster along the [ À 110] direction compared to the [110] direction at this substrate temperature [32], as the surface tension reduces the droplet can be expected to become elongated along the [ À 110] direction, resulting in the observed anisotropic mound shape.…”

Mechanism and applications of local droplet etching

“…The central process for the removal of substrate material below the droplet is diffusion of arsenic from the substrate into the liquid [1,3]. But the solubility of As is limited for instance to a maximum value of about 7 Â 10 À 4 in liquid Ga at a usual LDE temperature of 570 1C [20]. This would stop etching and an additional process reducing the As concentration inside the droplet material is required in order to keep etching running.…”

Simple Theoretical Estimates of the Enthalpy of Antistructure Pair Formation and Virtual‐Enthalpies of Isolated Antisite Defects in Zinc‐Blende and Wurtzite Type Semiconductors

“…Then, we may reduce Eq. [32] and [33] [36] hHf0(P,GaP) =--0.52 eV, ASf~ GaP)=--2.81k [37] In order to estimate the entropy of the real reactions [24]- [27], it is assumed that the virtual entropies of both Vca x and Vp x, Eq. [16], are the same as the best estimates (37,38) of AS(Vsi x) and AS(VGe X) AS(VGa x) = ~S(Vp x) = kln3 = 1.10k [38] This value corresponds to an assumption that the Jahn-Teller distortion about VGa x and Vp x is 3-fold degenerate, as it is for Vsi x, and that any contribution to AS(V x) due to a shift in lattice mode frequencies (37-39) is negligible.…”